Method of making waxed paper bags



Dec. 11, 1934. A. B. KEHR 1,983,939

METHOD OF MAKING WAXED PAPER BAGS Filed Nov. l0, 1932 A TTORNEYSPatented Dec. 11, 1934 UNITED STATES PATENTOFFICE METHOD OF MAKING WAXEDPAPER BAGS Abraham B. Kehr, Philadelphia, Pa.

Application November 10, 1932, Serial No. 642,071

4 Claims. (Cl. 93-35) This invention relates to new and useful1mprovements in paper bags and particularly to that type of bag which isresistant to moisture, grease, oil and fat and is therefore suitable forthe packaging of food stuffs such as nuts, potato chips, etc. Such bagsare ordinarily made of a paper which had been previously treated withparailin wax.

Paper bags are ordinarily made by coating one marginal edge surface of asheet of paper with an adhesive such as glue, folding the opposite sideportion of the sheet inwardly to produce a tubular structure, unitingthe overlapping edges of said sheet by means of said adhesive, applyingadhesive along a line near one end of said tube and folding the end ofthe tube over said line of adhesive and on to the body of the tube. Thisgeneral method is inapplicable to paper which had previously beentreated with wax to render it moisture, grease,'oil and fat proof. Thereason is that thus far no adhesive has been developed which willpenetrate a waxed surface or cause wax surfaces to adhere.

In Patent No. 1,782,884, dated November 25, 1930, it has been suggestedthat in the preparation of the waxed paper, the wax coating be omittedfrom the surfaces of the edges to be joined so that a suitable gluemight thereafter be applied to the untreated surfaces to produce asatisfactory joint in the completed bag. This process has disadvantageswhich precludes it from coming into general use.

The primary object of the present invention is to provide a method formaking a bag out of waxed paper without the use of special adhesives orglues and without resort to complicated procedures or apparatuses.

Another object is to provide such a method which may be carried out as.a continuous operation by means of automatic machinery differing inminor details from the conventional machinery now used in manufacturingordinary bags. v

Still another object is to produce a bag made entirely of waxed paper.

The essence of the invention which renders the foregoing objectspossible of attainment rechloroform, dichlorethylene (dielneY, ethylenedichloride, hexachlorethane (perchlorethane) the Ketols,pentachlorethane (pentaline) tetrachlorethane (tetraline),tetrachlorethylene (etaline), trichlorethylene (trieline) andturpentine. Other suitable solvents will readily suggest themselves tothose skilled in the art.

Referring to the drawing: v

Figure 1 vis a diagrammatic representation in side elevation-of acontinuous process embodying the inventive concept of the presentapplication, and

Figure 2 is a diagrammatic representation in plan of the same mechanicalembodiment of the invention.

Referring in greater detail to the drawing, the reference numeral 1denotes a continuous web of waxed paper drawn in any suitable or' wellknown manner from the source of supply 2. The web 1 passes below thesolvent applying means 3 which applies a line-of solvent on the uppersurface of one of the marginal edges of the web and over the solventapplying means 4 which applies a line of solvent on the lower oppositemarginal surface of the web. Either or both of the devices for applyingthe solvent may be of any desired type such as spraying devices,transfer rolls, etc. The two devices may be disposed on the sametransverse line or as shown in the drawing, The web 1 then passes underthe adhesive applying device 5 which applies a line of adhesive on oneof the lines of solvent. I have shown the adhesive being applied on theupper marginal surface, but clearly it may be applied to the loweropposite marginal surfaces The treated web then passes through the tubeformer 6 which brings the two treated marginal surfaces into overlappingrelation thus forming a continuous tube 7. Suitable devices (not shown)may be provided to cause the overlapping edges to adhere.permanently.The cutter 8 then cuts the tube into individual blanks 9.

The individual blanks 9 are finally made into bags 10. The onlydeparture from conventional procedure consists in applying a solvent onboth sides of the line of fold 11 so that the adhesive will penetratethe waxed surfaces and cause them to adhere firmly. Inr the drawing, Ihave indicated applying solvent from a spray or other applying means 12on one side ofthe line of fold 11, then applying adhesive on the sameline from a source of supply 13 and applying solvent from a source ofsupply 14 on the other side of the line of fold. However, I am notprecluded from applying the solvent to both sides of the line of fold 11simultaneously in any manner well known to the art. Finally, the end ofthe tube is bent back on to the body of the bag and caused topermanently adhere by means of the applied solvent.

My method has been described and illustrated in connection with thetubular type of bag, i. e. a bag made by forming a web of waxed paperinto a tube and sealing the overlapping edges, but it may be applied tothe manufacture of other types. Thus, for instance, it lends itselfreadily to the manufacture of the type of bag disclosed by Gurwick inPatent No. 1,714,265, i. e. a bag made by uniting two superposed sheetsof paper of proper size along three of their edges.

Furthermore, I have illustrated my process as being carried out in acontinuous and progressive series of steps so that it can be performedmeans of automatic machinery of the type now in general use in theindustry. In fact, only minor changes are necessary in conventionalmachinery to adapt it for carrying out the herein described process.However, I am not precluded from carrying out my process by hand or bymeans of special types of machinery.

The foregoing constitutes the essential and distinctive thought of mynew process, but it will be understood, of course, that the same may becombined with various other steps and details without effecting thepeculiar results obtained.

I claim:

1. In a method of making a bag from a sheet of waxed paper, the steps ofapplying a wax solvent on the upper surface of one marginal edge of Saidsheet and on the lower surface ofthe opposite marginal edge, applyingadhesive to the surface of one of said marginal edges and forming thesheet into a'tube with the treated surfaces in overlapping relation. i

2. In a method of making a bag from a tube of waxed paper, the steps ofapplying a wax solvent along two lines near one end of said tube,applying adhesive along one of said lines and folding said end over on aline intermediate said treated lines.

3. In a method of making bags from a web of waxed paper, the steps ofcontinuously applying a wax solvent along the upper surface of one edgeof said web and along the lower surface of the opposite edge,continuously applying an adhesive along one of said treated surfaces,forming the web progressively into a tube with the trated surfaces inoverlapped relation, and severing the tube into individual blanks,

4. In a method as defined in claim 3, wherein a wax solvent is appliedalong two lines near one end of the tube, an adhesive is then appliedalong one of said lines and the said end is folded on a lineintermediate the said l,two treated lines.

ABRAHAM B. KEHR.

